Patent GB-302374-A (GB)
Title: Improvements in wrapping machine
IPC: B65B11/02
Filed: 1927-07-13
Abstract: 302,374. Dehn, F. B., (Mills Novelty Co.). July 13, 1927. Packeting by wrapping- up.-A wrapping machine, of the type in which a wrapper is delivered to receive the article to be wrapped and is then closed about the article, comprises a support to which the wrapper is delivered, and mechanism for delivering the article to be wrapped on to the support whilst the wrapper is held thereon and closed thereabout circumferentially combined with mechanism for closing the ends of the package whilst the package in the partly closed conditions is maintained on the support. Driving mechanism. The machine comprises a bed plate 15, Fig. 5, mounted on pillars 14, Fig. 6, supported by a base 11, and carrying pillars 39 on which side plates 37 are mounted. A cam shaft 23, driven by a main shaft 17 provided with a clutch 22, drives vertical cam shafts 31, 32 which actuate the end folders of the wrapping mechanism and control the gripping action of mechanism which transfers a row of mints or other articles to be wrapped to a support 124 on which the wrapping is effected. The shaft 23 also drives, through chain and sprocket gearing, a shaft 36 which' actuates mechanism for feeding wrapping material 45 from a roll 41, cutting off a length from a wrapper and transferring the cut-off length to the support 124. f Wrapper feeding and severing mechanism. Feeding rolls 53, 54 driven intermittently from the shaft 36, draw the wrapping material, for example lead foil with a lining of waxed paper, from the roll 41 between guide members 67, 68 supported by the side plates 37 which also support the roll 41. The outer guide member 68 may be turned aside to allow access to the strip of material and the outer roll 54 is mounted in a pivoted yoke 74 adapted to be lifted out of the way when a fresh roll 44 is being inserted in the machine. A stationary cutter 86 secured to the guide member 67 coacts with a moving cutter 85, actuated through lever mechanism (not shown) by a cam on the shaft 36, to sever a length of material which drops into a gripping device comprising jaw members 103, 104, Fig. 20. These members are mounted on short shafts' 107. the upper member 104 loosely and the lower one 103 rigidly, and the shafts turn with some friction in their bearings 108 on the bed plate 15. A link 113 connects the upper jaw member 104 to a spring-controlled lever 114 adapted to be reciprocated bv a cam 118 on the shaft 36. The material 45 is fed against a stop pin 120 and the severed length 121 is transferred to the support 124 by the jaw members 103, 104, the upper member 104 being moved downwards for this purpose and closing on the lower member 103 which is formed with a shoulder 122 adapted to give a preliminary curvature to the end of the wrapper 121 On the return movement of the lever 114, the upper jaw member is raised, opening the jaws and the lower member follows when it is engaged by a pin on the upper member. Article-feeding mechanism. As soon as the wrapper is placed upon the support 124, a row of mints is transferred to it from a tray 131 on a support 132 where they are held by a spring lip 157. Parallel arms 133, Fig. 5, engage the ends of the row. the arms being mounted on shafts 134 along which they are adapted to be moved away from or towards each other by levers 141 actuated by cams 144 on the shafts 31, 32 and engaging in grooves in collars 137 on the arms 133. When the arms have been moved inwards to engage the row. links 146, Fig. 6, pivoted to the arms 133 are drawn downwards by a lever 147 operated by a cam 154 on the shaft 23. the movement turning the arms 133 about the shaft 134 to deliver the mints on to the wrapper and force it and the mints into a recess 127 in the support 124. Folding mechanism. The wrapper is folded around the mints by jaws 161, 173 pivoted to the support 124. The jaw 161, actuated by a cam on the shaft 23 through a lever 166 and link 165, operates first to fold over one edge of the wrapper before the jaw 173, which is actuated in a similar manner bv another cam on the shaft 23, folds over the opposite edge. As the jaw 173 effects the folding, the jaw 161 is retracted a little way to allow it to fold the wrapper closely against the mints, the jaw 161 being then returned to press on the wrapper. End folding is effected by reciprocating members disposed at opposite ends of the support 124 and comprising plungers 185, Figs. 5 and 16, slidably mounted in bearings 186 on the plate 15. Mounted upon the inner end of each plunger 185 are pivoted fingers 187 having bell crank extensions 189 disposed in a groove 191 in a collar 192 slidable upon the plunger 185, the collar having a groove 193 adapted to be engaged by a lever 195 rocked by a cam 198 on the shaft 32 or 31. The outer end of the plunger carries a collar 218 adapted to limit its movement in the bearing 186 and is formed with a recess 'to accommodate a spring 224 which presses against a collar 222 on a sleeve 201 slidably disposed in the plunger 185. Within the sleeve 201 is a slidable rod 202 provided with a collar 203 engaged by a lever 206 rocked by a cam 212 on the shaft 32 to reciprocate the rod. A spring 226 is disposed between the end of the sleeve 201 and the collar 203. In operation, lever 206 moves forward the rod 202 and consequently the sleeve 201 and plunger 185, the movement of the latter opening the fingers 187. The collar 192 is now moved with the plunger until the collar 218 checks the motion of the latter, when the collar continues its movement to turn the fingers inwards and crimp the ends of the wrapper to the form shown in Fig. 11. The collar 192 is now retracted and further movement of the lever 206 thrusts the sleeve 201 out of the plunger 185, its flanged concave end 235 pressing against the end of the package. When the collar 222 prevents further movement of the sleeve 201, the spring 226 is compressed and the rod 202 presses in the centre portion of the end of the package, completing the folding. The folding devices are then withdrawn from the package. Delivery mechanism. The package is gripped at its ends by studs 237, Fig. 22, on arms 236 pivoted to a plate 241 slidably disposed in a bar 243 which is supported by arms 246 mounted on a rocking shaft 247 and carrying a bar 245 which engages in an inclined slot 244 in the bar 243. Inwardly directed extensions 274 of the bars 236 are secured together by a pin passing through a slot in the plate 241 which has outwardly extending arms 264 supported by links 265 secured to a shaft 266 mounted to turn stiffly in its bearings. In operation, the rocking shaft 247 is turned clockwise by a link 251 actuated through a resilient lever 252, Fig. 6, by a cam on the shaft 36. The bar 243 is moved inwards carrying with it the plate 241, the friction in the mounting of the links 265 causing the arms 236 to open. On the return movement, the friction causes the arms to close on the package and hold it until the movement again changes. The slot 244 causes the arms to lift the package out of the support 124 and when they release it, it falls into a shoot 276 shaped to direct it endwise on to a tray 31 on a carriage 277 supported by an inclined track 278. The carriage moves by gravity to expose a space for each package, its movement being controlled by a pawl 281, Fig. 5, actuated by a rod 288 secured to a stud on a collar 291 on the rocking shaft 247. When the tray is filled, a spring- pressed angular member 293 on the pawl 281 moves past its end drawing with it a link 295 connected to a bell crank lever 296. The lever 296 pushes aside a lever 299 which normally acts as a stop for a spring-controlled lever 305 connected to the main clutch 22 of the machine, whereupon the lever 305 disengages the clutch and stops the machine. The lever 299 may be actuated by hand.